linux-kernel - [PATCH v12 1/3] Bluetooth: hci_uart: add prepare callbacks to hci_uart

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Date:	Tue, 9 Aug 2016 22:02:31 +0530
From:	Amitkumar Karwar <akarwar@...vell.com>
To:	<linux-bluetooth@...r.kernel.org>
CC:	<linux-kernel@...r.kernel.org>,
	<linux-rockchip@...ts.infradead.org>, <marcel@...tmann.org>,
	Ganapathi Bhat <gbhat@...vell.com>,
	Amitkumar Karwar <akarwar@...vell.com>
Subject: [PATCH v12 1/3] Bluetooth: hci_uart: add prepare callbacks to hci_uart_proto structure.

From: Ganapathi Bhat <gbhat@...vell.com>

The new callback is used to prepare the device before HCI becomes
ready. One can use this to download firmware if the download process
doesn't use HCI commands. Also recv_for_prepare callback is
introduced for receiving data from devices during prepare phase.

Signed-off-by: Ganapathi Bhat <gbhat@...vell.com>
Signed-off-by: Amitkumar Karwar <akarwar@...vell.com>
---
 drivers/bluetooth/hci_ldisc.c | 11 ++++++++++-
 drivers/bluetooth/hci_uart.h  |  3 +++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c
index dda9739..d7184dc 100644
--- a/drivers/bluetooth/hci_ldisc.c
+++ b/drivers/bluetooth/hci_ldisc.c
@@ -551,8 +551,11 @@ static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data,
 	if (!hu || tty != hu->tty)
 		return;
 
-	if (!test_bit(HCI_UART_PROTO_READY, &hu->flags))
+	if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
+		if (hu->proto->recv_for_prepare)
+			hu->proto->recv_for_prepare(hu, data, count);
 		return;
+	}
 
 	/* It does not need a lock here as it is already protected by a mutex in
 	 * tty caller
@@ -639,6 +642,12 @@ static int hci_uart_set_proto(struct hci_uart *hu, int id)
 		return err;
 
 	hu->proto = p;
+	if (p->prepare) {
+		err = p->prepare(hu);
+		if (err)
+			return err;
+	}
+
 	set_bit(HCI_UART_PROTO_READY, &hu->flags);
 
 	err = hci_uart_register_dev(hu);
diff --git a/drivers/bluetooth/hci_uart.h b/drivers/bluetooth/hci_uart.h
index 839bad1..17ba3b4 100644
--- a/drivers/bluetooth/hci_uart.h
+++ b/drivers/bluetooth/hci_uart.h
@@ -67,8 +67,11 @@ struct hci_uart_proto {
 	int (*close)(struct hci_uart *hu);
 	int (*flush)(struct hci_uart *hu);
 	int (*setup)(struct hci_uart *hu);
+	int (*prepare)(struct hci_uart *hu);
 	int (*set_baudrate)(struct hci_uart *hu, unsigned int speed);
 	int (*recv)(struct hci_uart *hu, const void *data, int len);
+	int (*recv_for_prepare)(struct hci_uart *hu, const void *data,
+				int len);
 	int (*enqueue)(struct hci_uart *hu, struct sk_buff *skb);
 	struct sk_buff *(*dequeue)(struct hci_uart *hu);
 };
-- 
1.8.1.4